Johnson & Johnson single dose Covid-19 vaccine shows 66% efficacy 7 months ago

Johnson & Johnson single dose Covid-19 vaccine shows 66% efficacy

"Not a single person who got vaccinated, and had illness after four weeks, ended up in the hospital."

A single shot of Johnson & Johnson's Covid-19 vaccine is effective in preventing moderate to severe illness due to Covid-19.

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According to interim data published from a phase-3 trial, the single dose vaccine has shown 66% efficacy at preventing moderate and severe Covid-19.

The company said the vaccine had a 72% efficacy in preventing Covid-19 in their US trial but a lower rate of 66% were observed in a larger global trial which tested against multiple variants.

The vaccine also proved 85% effective in preventing severe disease and showed complete protection against Covid-related hospitalization and death as of day 28.

"Not a single person who got vaccinated, and had illness after four weeks, ended up in the hospital," Dr. Mathai Mammen, global head of pharmaceutical research and development at Johnson & Johnson, told NBC News.

The trial included almost 44,000 participants and no significant safety concerns were reported.

J&J's chief executive, Alex Gorsky, said the results were a "critical milestone" and said the company would be applying for authorisation for emergency use in the US in February.

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The company will begin shipments immediately if approval is granted.

The European Union already has agreed a deal to purchase 200 million doses for the bloc in 2021 with shipment deliveries beginning in April, depending on approval from the Europeans Medicines Agency.